What data sources does PropData use?

PropData aggregates 10 sources: County Assessor Records, HUD Fair Market Rents, Zillow ZORI, Realtor.com Research, Redfin Market Tracker, US Census ACS, FHFA House Price Index, FRED macro data, and a proprietary Estimate Engine (mortgage rates, shelter CPI, housing starts). Plus a proprietary weighted rent estimate engine. All normalized and served from Cloudflare edge cache at sub-50ms.

How is PropData different from RentCast?

PropData charges a flat $49/month with zero per-call fees. RentCast charges $0.01–0.05 per API call — at 10,000 calls/month that is $100–500. PropData also includes ten data sources vs RentCast's rent estimates only: sale-to-list ratio, vacancy rates, median income, home price appreciation, and computed investor signals are not available in RentCast. Free tier available with no credit card required.

How fast is the PropData API?

PropData is built on Cloudflare Workers with a KV edge cache. All market data is cached at the edge with a 7-day TTL, resulting in average response times under 50ms globally.

What areas does PropData cover?

PropData covers all 50 US states plus DC at the ZIP, state, and metro level. Over 33,000 ZIP codes are covered for rent and market data.

⚡ New — County Assessor Records · 10 Sources · Free Tier

Property data.
Rent data.
One API.

The real estate data layer developers actually want. Rent trends, sale-to-list ratios, vacancy rates, bedroom-level HUD rents, live mortgage rates, and AI investor signals — merged from 10 sources into one clean JSON response. No per-call fees. No enterprise contracts. Ship in an afternoon.

Get API key → vs RentCast

33K+ZIP Codes

<50msEdge Latency

742K+Parcels Indexed

45+Data Points/Call

Live API — Try it now

LIVE

propdata-api-worker.sales-fd3.workers.dev/v1/market?zip=55101

// PropData API — Live demo // Fetching market data for 55101... █

165+ CF Workers KV Edge Cache Supabase Zillow ZORI Realtor.com Redfin HUD FMR Census ACS FHFA HPI FRED

Data Sources

Ten sources.
One response.
Zero compromise.

PropData aggregates 10 sources — Zillow ZORI, Realtor.com, Redfin, HUD Fair Market Rents, Census ACS, FHFA HPI, FRED macro data, a proprietary Estimate Engine, and County Assessor Records — 742,000+ King County WA parcels live, growing to 20+ counties. Owner names, assessed values, last sale prices, skip trace. Flat $49/mo. Zero per-call fees.

SOURCE 01

Fair Market Rents

U.S. Dept. of Housing & Urban Development

The government's official rent benchmark — the same data used to set Section 8 voucher amounts. Every county in America. Studio through 4-bedroom. Ground truth for affordability analysis.

STUDIO1BR2BR3BR4BRCOUNTY-LEVELFREE GOVT DATA

SOURCE 02

Observed Rent Index

Zillow Research

ZORI — Zillow's smoothed median asking rent for all homes and multifamily. The most cited rent trend dataset in real estate. ZIP, metro, state, and national with 10 years of history.

MEDIAN RENTYOYMOMZIP-LEVEL10 YR HISTORY

SOURCE 03

Market Metrics

Realtor.com Research

Monthly listing data: median prices, days on market, active inventory, new listings, price reductions, price per sqft. The pulse of the for-sale market at ZIP level.

DOMPRICE/SQFTINVENTORYPRICE CUTS

SOURCE 04

Market Tracker

Redfin

Sale-to-list ratio, % sold above list, days to pending, months of supply. The sharpest demand signal in public real estate data.

SALE/LIST RATIO% ABOVE LISTDAYS TO PENDING

SOURCE 05

ACS Demographics

US Census Bureau

Vacancy rates, renter %, median income, rent-to-income ratio. Affordability context nobody else includes at this price.

VACANCY RATERENTER %RENT BURDEN

SOURCE 06 — LIVE

FRED Macro Data

Federal Reserve Bank of St. Louis

Mortgage rates, shelter inflation, national vacancy rate, and housing starts. National economic context alongside local market data — no other API at this price point includes this.

MORTGAGE RATESSHELTER CPIHOUSING STARTS

SOURCE 07 — LIVE

House Price Index

FHFA — Federal Housing Finance Agency

Quarterly home price appreciation by state and metro. The definitive government measure of home value change — used by mortgage lenders, Fed economists, and institutional investors.

HPI APPRECIATIONSTATE + METROQUARTERLY

SOURCE 08 — LIVE

Building Permits

US Census Bureau BPS

Monthly new construction by unit type. The forward-looking supply signal — permits today become inventory in 12-18 months. Predicts rent pressure before it shows up in listing data.

SINGLE FAMILYMULTIFAMILYSUPPLY SIGNAL

SOURCE 09 — PROPRIETARY

PropData Estimate Engine

PropTechUSA.ai

Weighted rent estimate model built on owned data. ZORI (40%) + Census ACS (25%) + HUD FMR (20%) + Redfin cap rate (15%). Returns low/mid/high range with confidence score. No third-party dependency. No scraping. Ours.

RENT ESTIMATESBEDROOM-LEVELCONFIDENCE SCORE

Infrastructure

Built on Cloudflare.
Zero cold starts.
Global edge.

PropData runs on 10+ dedicated Cloudflare Workers with a shared KV cache and Supabase backend. Every ingestion worker runs on its own cron — HUD weekly, ZORI and Realtor monthly. Data is cached at the edge and served in under 50ms anywhere in the world. This is the same infrastructure stack powering PropTechUSA.ai's 165+ production Workers.

🏗️

PropTechUSA.ai Infrastructure

PropData runs on 10+ dedicated Workers inside PropTechUSA.ai's 165+ Worker production stack — the same infrastructure powering IntelligentHomeBuying, IntelligentLandlord, and LHBUSA. No monolith. Pure edge.

DEPLOYED + LIVE

⚡

KV Edge Cache

All market data cached at Cloudflare's edge. 7-day TTL. Sub-50ms reads globally.

031d6a9e — ACTIVE

🗄️

Supabase Canonical Store

15+ normalized tables. ZORI, Realtor, Redfin, HUD FMR, Census ACS, FHFA HPI — ZIP, state, and metro tiers. Indexed for fast queries.

rlfyavnhbngwbldebrid

🔐

API Key Auth + Rate Limiting

Tiered access. Free 50/hr, Pro 500/hr, Internal unlimited. Keys provisioned in KV instantly.

STRIPE INTEGRATED

PropData — Built on PropTechUSA.ai's 165+ Worker Stack

HUD APIWeekly cron

→

Zillow S3Monthly CSV

→

Realtor + RedfinMonthly TSV

→

Census + FHFAAnnual / Quarterly

→

FRED APIWeekly live

→

Ingestion WorkersNormalize + upsert

→

SupabaseCanonical store

→

KV CacheEdge — 7d TTL

→

propdata APIYour API key

→

Your App<50ms

What You Get

Merged data.
Computed signals.

Every /v1/market response includes rent data, market velocity, affordability, FRED macro, and computed investor signals — all merged from 10 sources. Add /v1/property to get owner names, assessed values, and last sale history direct from county assessor records. ATTOM charges $2,000/mo for a fraction of this. You pay $49.

Est. Gross Yield6.8%

Rent Growth YoY+4.1%

Market VelocityFast — 24 days DOM

Inventory PressureLow — down 14% YoY

Selling Above List101.8% sale/list

Vacancy RateVery Tight — 3.2%

Rent Burden28% of income

Endpoints

GET/v1/marketFull profile

?zip=55101 | ?state=MN | ?metro=Minneapolis
Rent + listing + signals — one response

GET/v1/rentRent only

HUD FMR by bedroom + ZORI median asking rent
Fastest endpoint for rent-focused apps

GET/v1/listingMarket data

DOM, inventory, price/sqft, price cuts, new listings
For-sale market pulse at ZIP level

GET/v1/healthStatus

Source status + last ingestion timestamps for all workers

GET/v1/estimateRent estimate — Pro

?zip=55101&beds=2 | ?state=MN&beds=3
Proprietary weighted model · low/mid/high range + confidence score

API REFERENCE — v1

Build anything.
Ship fast.

One endpoint. Ten data sources. 8M+ data points. Proprietary estimate engine. Zero per-call fees. Everything you need to build institutional-grade real estate tooling.

BASE URL

https://propdata-api-worker
.sales-fd3.workers.dev

CONTENT TYPE

application/json

🔑

AUTHENTICATION

Every request requires your API key. Pass it as a header (recommended) or query parameter.

HEADER (RECOMMENDED)

x-api-key: pd_free_YOUR_KEY

QUERY PARAMETER

?api_key=pd_free_YOUR_KEY

⚡

ENDPOINTS

GET /v1/market Full market profile — rent + market + affordability + signals 10 sources

PARAMETERS

zip5-digit ZIP code — e.g. 55101

state2-letter code — e.g. MN, TX, FL

metroMetro name — e.g. Minneapolis

monthsHistory depth, default 12

RESPONSE SHAPE

snapshot.rent → ZORI + HUD FMR

snapshot.market → Realtor + Redfin + FHFA

snapshot.affordability → Census ACS

snapshot.signals → 8 computed signals

macro → FRED (mortgage, CPI, starts)

history.rent_trend → 12mo ZORI

history.market_trend → 12mo Realtor

sources → 9 attribution labels

# by ZIP

GET /v1/market?zip=55101

# by state

GET /v1/market?state=MN

# by metro

GET /v1/market?metro=Minneapolis

# with history depth

GET /v1/market?state=TX&months=24

GET /v1/rent Rent-only — ZORI median asking rent + HUD FMR by bedroom lighter + faster

GET /v1/rent?zip=55101 # same params: zip | state | metro

GET /v1/estimate Proprietary rent estimate — weighted model, 4 sources Pro

GET /v1/estimate?zip=55101&beds=2 # 0=studio 1 2 3 4

GET /v1/estimate?state=MN&beds=3

Returns: monthly_low / monthly_mid / monthly_high + confidence_pct + market_trend
Model: ZORI 40% · Census ACS 25% · HUD FMR 20% · Redfin cap rate 15%

GET /v1/health System status + last ingestion timestamps for all workers no auth

GET /v1/health # no API key required

{'}'}

CODE EXAMPLES

const res = await fetch(
  'https://propdata-api-worker
   .sales-fd3.workers.dev/v1/market
   ?state=MN',
  { headers: {
    'x-api-key': 'YOUR_KEY'
  } }
);
const data = await res.json();
// data.snapshot.market.hpi_1yr_chg
// data.snapshot.signals[0].value

📊

RATE LIMITS

TIERREQ/HRPRICE

Free 50 $0/mo

Pro popular 500 $49/mo

Enterprise ∞ Custom

ERROR CODES

401 Invalid or missing API key

404 No data for this location

429 Rate limit exceeded — upgrade to Pro

500 Server error — contact support

READY TO BUILD?

Get your API key in 10 seconds.

Free tier. No credit card. No BS.

PropData vs The Market

The only API that gives you
data AND intelligence.

→ Read the full RentCast comparison + cost calculator

RentCast is a rent lookup. ATTOM and CoreLogic are enterprise contracts with sales calls and procurement. PropData is the only API at any price point that bundles live mortgage rates, vacancy data, investor signals, and a proprietary rent estimate engine — with a free tier, no credit card, no per-call fees. Ever.

Feature	PropData	RentCast	ATTOM	CoreLogic
Pricing	Flat $49/mo	Per call	$500+/mo	$1,000+/mo
At 10,000 calls/month	$49 flat	$100–500	$500+	$1,000+
Free tier — no credit card	✓	—	—	—
No per-call fees ever	✓	—	—	—
FRED macro data (mortgage rate, CPI, starts)	✓ Exclusive	—	—	—
AI investor signals (computed)	✓ Exclusive	—	—	—
Rent by bedroom (HUD FMR)	✓	✓	—	—
Median asking rent trend (ZORI)	✓	✓	✓	✓
Days on market + inventory	✓	—	✓	✓
Affordability data (Census ACS)	✓	—	✓	✓
Home price appreciation (FHFA HPI)	✓	—	✓	✓
Proprietary rent estimate engine	✓	✓	✓	✓
ZIP + State + Metro coverage	✓	✓	✓	✓

Pricing

Simple pricing.
No surprises.

Flat monthly access. Your API key is live the moment you sign up. No credit card required for the free tier. Cancel pro anytime. Enterprise gets direct founder access.

Starter

free forever

50 requests per hour
All endpoints
ZIP, state, metro queries
Investor signals included
No SLA guarantee
Community support

Pro

^$49

per month

500 requests per hour
All endpoints
36 months of history
Investor signals
Email support
Cancel anytime

Property Pro

^$99

per month

Everything in Pro
County assessor data
Owner name + address
Assessed & market values
Last sale price + date
Skip trace lookup
Delinquent tax filter
Bulk ZIP export

Enterprise

$—

custom

Unlimited requests
White-label available
Custom data sources
SLA + dedicated support
PropTechUSA.ai integration
Direct founder access

PROPRIETARY — SOURCE 09

The only rent estimate
you actually understand.

Every other rent estimate API gives you a number and no explanation. PropData shows you exactly how it was calculated — four sources, explicit weights, full confidence score. You own the logic. You can explain it to any client or investor.

40%

Zillow ZORI — actual market asking rents

25%

Census ACS — all occupied rentals, not just listed

20%

HUD FMR — government bedroom-level benchmark

15%

Redfin cap rate model — implied rent from sale prices

Get the estimate engine →

BUILT WITH THIS

🏠 Rental pricing tools for landlord software

🤖 AI agents that explain rent to buyers

📊 Investment screeners across all 50 states

/v1/estimate?state=MN&beds=2

// Proprietary rent estimate — MN, 2BR

"estimate": {

"bedrooms": 2,

"monthly_low": 1288,

"monthly_mid": 1400,

"monthly_high": 1512,

"confidence_pct": 100,

"market_trend": "stable",

"yoy_rent_change": "+3.98%"

"sources_used": 4,

"model": "PropData Weighted Multi-Source"

USE CASES

What developers build
with PropData.

One API key. Ten sources. Owner names, assessed values, rent trends — the complete data layer for the next generation of real estate tools.

🏠

Rental Pricing Tools

Call /v1/estimate with any ZIP + bedroom count to get low/mid/high rent ranges with confidence scores. Build the pricing feature your landlord software is missing.

ESTIMATE ENGINE + HUD FMR

📊

Investment Screeners

Pull gross yield, vacancy rate, rent-to-income ratio, and DOM for any market. Screen 50 states in 50 API calls. Find the markets worth underwriting before your competitors do.

ZORI + REDFIN + CENSUS + FHFA

🤖

AI Real Estate Agents

Feed PropData into your LLM context. Give your AI the same market intelligence a top broker uses — rent trends, DOM, affordability, macro rates — in one structured JSON call.

ALL 10 SOURCES + SIGNALS

📱

Market Report Apps

One call to /v1/market gives you a full market report — 12 months of history, signals, macro context. Build the neighborhood report card nobody else has.

REALTOR + REDFIN + FRED

💼

Mortgage & Affordability Tools

Combine live 30yr mortgage rates from FRED with median list prices, vacancy rates, and median income. Build the buy-vs-rent calculator that actually uses current data.

FRED + CENSUS + FHFA

🏗️

Supply Pipeline Signals

Housing starts surging? Permits up? Cross-reference with local vacancy and DOM to predict where rent growth is heading 12-18 months out. Data no other $49/mo API touches.

FRED + CENSUS PERMITS + FHFA

🗺️

Section 8 & Voucher Tools

HUD Fair Market Rents by bedroom for every county — the exact data used to set Section 8 voucher amounts. Build compliance tools, subsidy calculators, or affordable housing screeners.

HUD FMR — EVERY COUNTY

📰

Real Estate Newsletters

Automate your weekly market update. Hit PropData on a cron, get fresh rent trends, DOM, inventory changes, and macro context — format it and send. Institutional-grade data in every issue.

ZORI + REALTOR + FRED

⚡

Your idea here.

If it needs real estate market data, PropData can power it. Free key in 10 seconds. No credit card.

RentCast charges per call.
ATTOM charges enterprise.
PropData charges $49.

The only API with rent data, market velocity, and county assessor records — owner names, assessed values, skip trace — all at $49/mo flat. Built by Justin Erickson / PropTechUSA.ai. The data ATTOM charges $2,000/mo for. Free tier, no credit card. 165+ Cloudflare Workers in production.

Talk to us

Property data.Rent data.One API.

Ten sources.One response.Zero compromise.